If you made any of these changes, you need to re-start apache.
Did you create the info.php file? If not, open a text editor and type the following in it: <?php phpinfo();?>
Save it as info.php in your /var/www/htdocs directory and also a copy in your public_html directory in your home directory. Try accessing it in the /var/www/htdocs by opening a browser and entering:
http://localhost/info.php
If that doesn't work (probably won't) open the browser and enter the following:
http://localhost/~javelin93/info.php (change javelin93 to whatever your actual username is. If this works you should get a lot of information which might help resolve the problem.
When you added .httpd-php .php to Add Type Application, did you put the period (.) in front and a space between?
Not sure if this will help. Are you saying that now you are unable to access anything on apache or just not php files?